Patent GB-1246981-A (GB)
Title: Carton forming machine
Inventor: SCULLY JOHN WILLIAM
IPC: B31B50/52
Filed: 1968-09-09
Abstract: 1,246,981. Making cartons. PNEUMATIC SCALE CORP. 9 Sept., 1968, No. 42743/68. Heading B5D. [Also in Divisions B8 and F2] A machine for forming a carton of rectangular cross-section (see Division B8), which may be lined, comprises a device for wrapping a prescored carton blank 15, Fig. 3, about a forming block 10, Fig. 1A, the blank being divided by scored lines into a body portion 120 &c., bottom closing flaps 130 &c., top closing extensions subdivided by score lines into transverse sections 153, 154, 156 and a top closure flap 140 an intermittently operated conveyer 24 (see Division B8), Fig. 1A, for advancing the blank to the forming block, and a tucker device 254, Fig. 7, for folding portions of the top closing extensions along their scored lines to provide a two-ply band (157), Fig. 4 (not shown), to form three sides of a subsequently formed hinged top closure of the carton. Blanks 15, Fig. 1, are withdrawn from a stack 16 in a magazine 18 by a suction transfer device 36, the top of the stack being maintained at constant level by mechanism 48, and inserted between feed rolls 32, 34, the latter being raised periodically to receive a blank. The blanks 15 are then transferred to a continuously moving conveyer 20 (see Division B8) comprising a pair of spaced endless chains 74 having fingers 96 to engage the rear edges of the blanks, which then pass along a supporting plate 115 to an adhesive applying device 22 including a segmented roller 184 which applies areas of adhesive 134 &c., shown shaded, to each blank, the areas 172, 174 serving to adhere the blank to a lining blank 176 wrapped around the forming block 10. The segmented roller 184 may have a surface speed greater than that of the conveyer 20. The blanks 15 are then transferred to the intermittently operated conveyer 24 which is driven by a Geneva drive 214 (see Division F2). Chains 196 of conveyer 24 are moved in timed relation to the continuously operated conveyer 20 such that blanks delivered are disposed to be engaged by fingers 198. A blank 15 then passes to a folding mechanism 26, Fig. 1A, where a pair of vertically reciprocable clamping members 252, Fig. 7, which may be rubber-tipped, hold the blank when it comes to rest against plate 115. Simultaneously, a rockingly mounted tucker member 254 which includes a surface 294 which pushes the leading edge of the blank 15 rearwardly, Fig. 8 (not shown), and a bevelled blade 292 which engages the blank such that section 156 of the blank is folded about a score line 148, Fig. 3, to underlie the body portion of the blank and overlie the section 154 and be secured to the latter by adhesive areas 178 &c. As the tucker member 254 withdraws, Fig. 9 (not shown), a vertically reciprocable bar 255 descends an presses and sets the two-ply band (157) formed by the sections 154, 156 in co-operation with an anvil 342. The blank 15 then passes to a second pressing station 28, Fig. 1A, where a further bar (344), Fig. 10 (not shown), and anvil (380) co-operate to consolidate the two-ply band (157). The blank is then transferred on to an elevating platform 30 in timed relation to the arrival of one of a series of radially mounted and intermittently rotated forming blocks 10 and cones to rest against stops 384. Vertically reciprocable elevating side plates 388 and an elevating plate 386 push the blank 15 and fold it about the sides of the forming block 10, after which the portions of the blank extending above the forming block are folded to overlap and thes ide flap adhesive 164 is set by the lowering of a presser 390. The folded blank 15 is then passed to a further station where the bottom flaps are overlapped and secured. The carton is stripped from the forming block, filled, the mouth of the lining bag 176 closed and flaps 140, 158, 160, 162 overlapped and secured to form the hinged top closure.